In the automotive world, owning a Rolls-Royce Phantom is one of the ultimate expressions of wealth. This larger-than-life behemoth stands out among the throngs of vehicles crowding roadways the world over, turning heads everywhere it travels. For the 2015 model year, however, the British automaker is trying something a little different, with the Rolls-Royce Metropolitan Collection, a new addition to its Phantom line that will serve as a sort of city camouflage. Of course, attempting to offer an understated des…